And higgo, there's three completely different watches in those photos, and I'm not sure all are Seikos.
Or if they are they're serious custom mods.

Two are straight Seiko, SKZ209 (Land Shark) and SRP311 (Sharptooth Monster). The other is a 'Fifty Five Fathoms' mod of an SNZH53. The only things changed are the dial, hands, bezel insert, crystal, caseback and strap.

Two are straight Seiko, SKZ209 (Land Shark) and SRP311 (Sharptooth Monster). The other is a 'Fifty Five Fathoms' mod of an SNZH53. The only things changed are the dial, hands, bezel insert, crystal, caseback and strap.

Explains it! Who did the mods? Yokobies? I like the bezel with lume added.